This is a great way to review the Triangle Sum Theorem. Students look at different triangles and calculate the missing angle in each. They do not need protractors and should use subtraction and addition. This is a great way to review and works wonderfully as a filler activity. There are three sets of worksheets and answer keys are included.
What is the triangle sum theorem. How to prove it with examples and its corollary.

Triangle Side Sum Theorem
Learn the Exterior Angle Theorem of a triangle with a clear diagram, formula and easy example. The exterior angle is equal to the sum of the two opposite interior angles. Perfect for SSC CGL Maths, Geometry practice and quick revision. 📚
Teaching in Special Education: Angle Sum Theorem


What Is The Triangle Sum Theorem Formula
Sum of measures of all angles of the triangle is 180' Easy way to teach theorem in schools


Similar Triangles Reference Sheet for SSS, SAS, AA Theorems. Pretty handwriting notes made with the iPad and Notability App
Angle Sum Theorem For A Triangle
Geometry: Triangle Sum Theorem problems with Investigation for interactive notebook
This product includes a study guide, classwork, and homework on how to prove triangles congruent (SSS, SAS, ASA, AAS, HL). Students will also recognize triangles that cannot be proven congruent. Students will recognize these theorems. Students will label diagrams with givens, an determine how to prove the triangles congruent.









This editable geometry foldable organizes notes and practice for classifying triangles, the Triangle Sum Theorem, and the Exterior Sum Theorem.The foldable is organized by the following tabs:1. Classify Triangles (Definition and diagram for Triangle, Scalene, Isosceles, Equilateral, Acute, Obtuse, Right, Equiangular, Interior/ Exterior Angles)2. Triangle Sum Theorem (Solve for 'x' or find a missing angle using algebra)3. Exterior Angle Theorem (Solve for 'x' or find a missing angle using algebra)Perfect for interactive notebooks or as a standalone graphic organizer. This works great for guided note- taking or for summarizing and as a study tool.This resource is also included in the following bundles: High School Geometry Foldable Bundle High School Geometry Curriculum - Full Store BundleYo